Stainless Steel 446 Explained
Stainless Steel 446 is a high-chromium ferritic stainless steel specifically engineered for extreme heat and severe oxidation conditions. With outstanding resistance to scaling, sulfur-bearing gases, and continuous high-temperature exposure, Grade 446 is extensively used in furnace components, kiln linings, heat treatment equipment, and combustion systems. Its superior thermal stability and oxidation resistance make it ideal for continuous service above temperatures where most standard stainless steels fail. Stainless Steel 446 is the ultimate choice for critical high-temperature industrial environments.
446 STAINLESS STEEL SHEETS AND PLATES EQUIVALENT GRADES
| STANDARD |
|---|
| SS 446 |
SPECIFICATION OF STAINLESS STEEL 446 SHEETS AND PLATES
| Standard | ASTM A240 / ASME SA240 |
|---|---|
| Dimension Standard | JIS, AISI, ASTM, GB, DIN, EN, etc |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Length | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Thickness | 0.3 mm to 120 mm |
| Form | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc. |
| Surface Finishing | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, Chequered, embossed, hair line, sand blast, Brush, etching, SATIN (Met with Plastic Coated) etc. |
CHEMICAL COMPOSITION OF STAINLESS STEEL 446 SHEETS AND PLATES
| Grade | C% | Mn% | Si% | P% | S% | Cr% | Ni% |
|---|---|---|---|---|---|---|---|
| 446 | 0.20 max | 1.50 max | 0.75 max | 0.040 max | 0.030 max | 23.00 | 0.50 |
MECHANICAL PROPERTIES OF STAINLESS STEEL 446 SHEETS AND PLATES
| Tensile Strength | Yield Strength (0.2% Offset) | Elongation (%) |
|---|---|---|
| 75,000 Psi (485 MPa) | 40,000 Psi (275 MPa) | 20 |
💡 Practical Difference in Use
Use Stainless Steel 446 when: superior corrosion resistance, high-temperature oxidation resistance, and durability in aggressive environments are required. → Example: furnace parts, high-temperature industrial equipment, heat exchangers, and chimneys.
Applications of Stainless Steel 446 Sheets and Plates
Stainless Steel 446 is a high-chromium ferritic stainless steel with 23–27% chromium, designed for excellent oxidation and corrosion resistance in high-temperature and aggressive environments.
- High-Temperature Industrial Equipment: Furnace parts, combustion chambers, and heat exchangers.
- Power & Energy Plants: Chimneys, flue gas ducts, and high-temperature piping.
- Chemical & Petrochemical: Equipment exposed to aggressive atmospheres and mild corrosive chemicals.
When to Choose Stainless Steel 446?
Stainless Steel 446 is selected when long-term high-temperature corrosion resistance, oxidation resistance, and durability are critical for industrial and power applications.
Choose SS 446 when:
- High-temperature corrosion and oxidation resistance is essential
- Used in industrial furnaces, heat exchangers, and chimneys
- Durable ferritic stainless steel is required for aggressive environments
- Long-term performance under cyclic thermal conditions is critical
- Maintenance-free, high-durability components are desired
Industries That Use Stainless Steel 446 Sheets and Plates
Stainless Steel 446 is widely used in industries requiring high-temperature strength, oxidation resistance, and long-term durability in aggressive environments.
Primary application due to superior oxidation and heat resistance.
Uses
Furnace parts, combustion chambers, and heat exchangers.
Why SS 446?
Excellent performance at elevated temperatures and in oxidizing conditions.
Used in high-temperature piping, chimneys, and flue gas systems.
Uses
Chimneys, flue ducts, and heat-resistant pipelines.
Why SS 446?
Outstanding corrosion and oxidation resistance for long-term reliability.
Applied where exposure to mild corrosive chemicals and high temperatures is frequent.
Uses
High-temperature vessels, exhaust ducts, and process equipment.
Why SS 446?
Exceptional durability in aggressive and high-temperature environments.
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